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How to: Build a Wireless Bridge Using DD-WRT, Part II

"Configuring any of the four modes in DD-WRT requires a similar
recipe, each with just a few small differences.

"In all cases, your primary router does not need to have DD-WRT
installed. In fact, it can be any wireless router. You do not need
to change any settings on your primary router, although you should
know how to log into it to read some settings.